Woman approaches clerk at Smith's Pharmacy.
"I need to speak privately with Mr Smith please."
Mr. Smith - "How can I help you ma'am?"
"I need to buy some cyanide"
"I'm sorry ma'am. No can do. It's totally restricted and I risk my license."
Woman shows Mr Smith a photo of his wife and her husband making passionate love."
"Oh that's different, says Mr Smith, I didn't realize that you had a prescription.